Music legend David Bowie only died 18 months ago, but a new book is set to delve into his sprawling career and make sordid claims about his sex life.

The upcoming biography – David Bowie: A Life – has been written by British GQ editor Dylan Jones and claims Bowie was consumed by sex addiction and a dangerous cocaine habit.

The book was created from over 180 interviews with friends, rivals, lovers, and collaborators and sensationally claims the Life On Mars singer "slept with with groupies aged just 13" - but "refused to f*** a dead body".

The book alleges androgynous Bowie made his way from conquest to conquest during the 1970s, enjoying sex with both men and women and engaging in threesomes, group sex, multiple affairs and and even invited others to watch him have sex with women, according to the Daily Mail .

A new biography will delve into David Bowie's sex life and drug addiction (Image: PA)

David Bowie reaches out of a window to fans in 1989 (Image: Mirrorpix)

The icon's reputation as a sex addict even inspired a bizarre offering of a warm dead body to have sex with when he was on tour in Philadelphia in 1972 - claims famous groupie Josette Caruso.

Josette was invited back to Bowie's hotel room where he "properly seduced me - lots of kissing, lots of hugging, lots of f***ing," she said.

But later that night she claims she witnessed a bizarre incident as Bowie's bodyguard answered a knock on the door and called for David who went to the door and returned a few minutes later, "white as a sheet".

"He was visibly shocked. Someone had just turned up and offered him a warm, dead body for David to have sex with," she said.

"Who on Earth do they think I am? Why would they think I'd be interested in something like that?" a shaken Bowie told her.

"Why would I be interested in f***ing a dead body?"

David Bowie as Ziggy Stardust in the 1970s (Image: Rex Features)

Bowie plays a gig in Newcastle in 1997 (Image: NCJ Archive)

Elsewhere in the book, 70s British singer Dana Gillespie describes being his girlfriend when she was only 13 or 14 years old.

She claimed he arrived at her house dressed like Robin Hood as he came straight from a gig and her dad initially thought he was a girl because of his outlandishly long hair.

"Everyone thought he was gay and 'a bit theatrical for everyday guys,'" she said.

The book also describes Bowie's drug problems and claims that the height of Bowie's cocaine addiction came in LA in 1975 when he weighed just 95 lbs and was snorting seven grams of coke a day.

"David Bowie was his very own creation, his very own work of art. This was the boy from postwar Brixton with his sights set on the world," writes author Dylan Jones in the biography that will be published by Crown Archetype on September 7.

"His entire professional career was one of myth, legend and invention."

The music icon passed away in January last year after a battle with cancer age 69.